Pitch
Pitch is measured as the amount of rise in inches in 12 inches. Couple ways to measure
1) Hold a framing square against the edge of the roof so the top leg is level, the side leg is hanging down. Slide it out till your measuring point (roof edge or drip edge) is at the 12" mark. Then look at the vertical leg and see what that same measuring edge relates to in inches.
2) Hold a 12" long board level with the end touching your roof surface. Measure down from the other end, bottom of that board to the roof. That distance is the pitch
As I recall your house, the pitch is going to be somewhere between 4 in 12 and 6 in 12. They typically do it in even increments (4,5,6) but with today's builders, you'll need to measure it to be sure.
Take a picture of one of your gables, from as far away as possibleand as perpendicular to the wall as possible (trying to eliminate the perspective) and post it. I should be able to make a pretty good guess from measuring the picture.
Paul
Paul